@dentaku: They are betting that in the long run the answer to your question for most people will be "AND", not "OR"

Analogy: if Windows 1/2/3/95 or whatever asked you on startup if you were using a keyboard OR if you were using a mouse. If you say keyboard you get DOS with no Windows elements. If you say mouse you get Windows with no access to a command prompt (or Powershell, entering formulas in Excel, or any other CLI-like interface element).